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error : no database listener

hi,
i have installed oracle9i in windows 2000 server of my pc. but when i am logging by scott/tiger, "no database listner" prompt is coming. but in sql * plus window showing "enter username". after giving scott/tiger here , i can log in . i have already checked tnsnames.ora file & in services tns listner is started.
what is the problem? how can i resolve this? pls help me. & reply to....arbarui@yahoo.co.in
thanks
arup